"Duplicate" means a counterpart produced:
1. By the same impression as the original;
2. From the same matrix;
3. By means of photography, including enlargements and miniatures;
4. By mechanical or electronic rerecording, including a counterpart produced by an optical imaging system;
5. By chemical reproduction; or
6. By other equivalent technique designed to ensure an accurate reproduction of the original.
(Added to NRS by 1971, 800; A 1995, 136)